This is a Biblical reference
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The Biblical allusion is from the Book of Revelation and the final battle between Jesus Christ with the armies of Heaven and the Beast (light and darkness), which will result in the defeat of the Anti-Christ and the kings of the earth.
When the sun touched his wingtips, the sea was still dark below. Then gradually, the shape and color of sea and earth became plain. He felt entirely alone and apart from this transformation, as if he watched from a separate planet. He checked his map. Far to the east he picked out Mount Carmel, and a river, and beyond were the hills of Megiddo, also called Armageddon. He continued to orbit.